Surface board, main rail shorted, can't find where

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  • survivalbloke
    Badcaps Veteran
    • Aug 2021
    • 268
    • United States

    #1

    Surface board, main rail shorted, can't find where

    This is MS board M1029273-001. I'm getting <.2 ohms on output of the second mosfet. Looking at a schematic, I injected 1v/5a to the resistor pin where this mosfet connects to, and it is drawing 3.7a but the only thing getting hot in the thermal camera is this resistor which surprises me.

    Where should I be looking from here?
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  • mon2
    Badcaps Legend
    • Dec 2019
    • 13910
    • Canada

    #2
    Re: Surface board, main rail shorted, can't find where

    Inject the voltage on the OTHER side of this current sense resistor and you should find the guilty party - most likely a shorted cap.

    Comment

    • survivalbloke
      Badcaps Veteran
      • Aug 2021
      • 268
      • United States

      #3
      Re: Surface board, main rail shorted, can't find where

      Originally posted by mon2
      Inject the voltage on the OTHER side of this current sense resistor and you should find the guilty party - most likely a shorted cap.
      That was it - it was the cap right beside the current sense resistor. Thanks!

      Comment

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